XYZ Corporation is renting space in a multi-tenant office building and has recently installed a new ERP WLAN in their office. The network administrator has very little experience with WLANs, and has recently purchased a WLAN protocol analyzer for diagnostic use. He has attended a wireless administration class and understands basic WLAN operation. During the course of troubleshooting a performance problem, the administrator cannot understand why he is seeing ATIM frames, CF-End frames, and PS-Poll frames on channel 2 all at the same time. You are hired by the administrator as a consultant to explain why this is happening. Which explanations are plausible?
A.
XYZ Corp’s WLAN is using channels 1, 6, and 11. The frames the administrator is seeing while capturing on channel 2 are corrupted frame fragments that the analyzer is attempting to interpret.
B.
Seeing ATIM frames, CF-End frames, and PS-Poll frames in the same capture is normal. Seeing these frames together means that Power Save mode is in use on an Ad Hoc network.
C.
XYZ Corp’s WLAN is using channels 1, 2, and 3. This design is causing adjacent channel interference, which is corrupting ERP-OFDM modulated frames. The analyzer is seeing this frame corruption and reporting the frames as it sees them.
D.
XYZ Corp’s infrastructure WLAN is using channel 2, and their neighbors in the same building are running Ad Hoc networks on channel 2 as well.